diff --git a/docs/contributing/python_guidelines.rst b/docs/contributing/python_guidelines.rst
index 95509cc9a2..ddc2199d62 100644
--- a/docs/contributing/python_guidelines.rst
+++ b/docs/contributing/python_guidelines.rst
@@ -10,7 +10,7 @@ We ask that all Python contributions adhere to the `PEP8 `_ compatibility library (use the pip version installed as a dependency, not the version bundled with Django).
+All contributions should support Python 2 and 3 and we recommend using the `six `_ compatibility library (use the version bundled with Django, ``django.utils.six``).
Django compatibility
~~~~~~~~~~~~~~~~~~~~